Refrigeration apparatus

Abstract

A refrigeration apparatus includes a compression mechanism, a heat source-side heat exchanger, a usage-side heat exchanger and an intercooler. The compression mechanism has compression elements arranged so that refrigerant discharged from a first-stage compression element is sequentially compressed by a second-stage compression element. The intercooler is connected to an intermediate refrigerant tube arranged and configured to draw refrigerant discharged from the first-stage compression element into the second-stage compression element. The intercooler is arranged and configured to cool the refrigerant discharged from the first-stage compression element and drawn into the second-stage compression element. The intercooler and the intermediate refrigerant tube and are arranged and configured to perform wet prevention control when a heat source temperature of the intercooler or an outlet refrigerant temperature of the intercooler is equal to or less than a saturation temperature of the refrigerant fed from the first-stage compression element to the second-stage compression element.

1 . A refrigeration apparatus comprising:
 a compression mechanism having a plurality of compression elements configured and arranged so that refrigerant discharged from a first-stage compression element of the plurality of compression elements is sequentially compressed by a second-stage compression element of the plurality of compression elements;   a heat source-side heat exchanger;   a usage-side heat exchanger;   an intercooler connected to an intermediate refrigerant tube arranged and configured to draw refrigerant discharged from the first-stage compression element into the second-stage compression element, the intercooler being arranged and configured to cool the refrigerant discharged from the first-stage compression element and drawn into the second-stage compression element; and   an intercooler bypass tube connected to the intermediate refrigerant tube so as to bypass the intercooler,   the intercooler, the intermediate refrigerant tube and the intercooler bypass tube being arranged and configured to perform wet prevention control so that refrigerant does not flow to the intercooler when a heat source temperature of the intercooler or an outlet refrigerant temperature of the intercooler is equal to or less than a saturation temperature of the refrigerant fed from the first-stage compression element to the second-stage compression element.   
     
     
         2 . The refrigeration apparatus according to  claim 1 , wherein
 the intercooler is a heat exchanger in which air is used as a heat exchange medium.   
     
     
         3 . The refrigeration apparatus according to  claim 1 , wherein
 the intercooler is a heat exchanger in which water is used as a heat exchange medium; and   the intercooler, the intermediate refrigerant tube and the intercooler bypass tube are arranged and configured such that water fed to the intercooler is stopped during the wet prevention control.   
     
     
         4 . A refrigeration apparatus comprising:
 a compression mechanism having a plurality of compression elements configured and arranged so that refrigerant discharged from a first-stage compression element of the plurality of compression elements is sequentially compressed by a second-stage compression element of the plurality of compression elements;   a heat source-side heat exchanger;   a usage-side heat exchanger; and   an intercooler which is a heat exchanger having water as a heat exchange medium, the intercooler being connected to an intermediate refrigerant tube arranged and configured to draw refrigerant discharged from the first-stage compression element into the second-stage compression element, and the intercooler being arranged and configured to cool the refrigerant discharged from the first-stage compression element and drawn into the second-stage compression element,   the intercooler and the intermediate refrigerant tube being arranged and configured to perform wet prevention control in which a flow rate of water that flows through the intercooler is reduced when a heat source temperature of the intercooler or an outlet refrigerant temperature of the intercooler is equal to or less than a saturation temperature of the refrigerant fed from the first-stage compression element to the second-stage compression element.   
     
     
         5 . The refrigeration apparatus according to  claim 4 , wherein,
 the intercooler and the intermediate refrigerant tube being arranged and configured such that the flow rate of water that flows through the intercooler is controlled so that the outlet refrigerant temperature of the intercooler is higher than the saturation temperature of the refrigerant fed from the first-stage compression element to the second-stage compression element during the wet prevention control.   
     
     
         6 . The refrigeration apparatus according to  claim 1 , further comprising
 a second-stage injection tube arranged and configured to branch refrigerant flowing between the heat source-side heat exchanger and the usage-side heat exchanger and to return the refrigerant to the second-stage compression element.   
     
     
         7 . The refrigeration apparatus according to  claim 4 , further comprising
 a second-stage injection tube arranged and configured to branch refrigerant flowing between the heat source-side heat exchanger and the usage-side heat exchanger and to return the refrigerant to the second-stage compression element.